[FLASH-USERS] Imaginary sound speed error in EOS

[Acharya, Nitish]

Dear flash-users,

I've been trying to use sesame EOS tables of Aluminum, Titanium and Plastic materials for a LaserSlab based simulation in FLASH. I've been getting this error

"Imaginary sound speed has obtained in hy_uhd_HLLC solver...."

1) I assume FLASH calculates sound speed from from these EOS tables using c = sqrt(gamc*pres/dens). When I looked in the tables, I found a lot of negative pressures data in the EOS. Is that the reason I might be getting this error? How should I deal with it?

2) What are other options of getting EOS tables of materials for use in FLASH? FLASH seems to only have IONMIX4 tables of He, Al and Polystyrene.

Thanks,
Nitish



---------------------------

Nitish Acharya

PhD Student

Department of Mechanical Engineering

University of Rochester
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